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Streaming queries use the extended query protocol with Execute(max_rows) to deliver results in windowed batches via PortalSuspended, rather than buffering all rows in memory. The client controls flow through fetch_more() and close_stream() on Session, receiving batches via pg_stream_batch on StreamingResultReceiver. Adds _StreamingQueryInFlight query sub-state with _completing and _error guards to prevent duplicate Sync and post-completion Execute messages. Dispatch for fetch_more/close_stream uses match on concrete type in _SessionLoggedIn rather than the _QueryState interface. Design: #125
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Implement windowed batch delivery using the extended query protocol's Execute(max_rows) + PortalSuspended mechanism. Unlike
execute()which buffers all rows before delivery, streaming enables pull-based paged result consumption with bounded memory.New public API:
StreamingResultReceiverinterface (pg_stream_batch,pg_stream_complete,pg_stream_failed)Session.stream(query, window_size, receiver)— starts streamingSession.fetch_more()— requests next batchSession.close_stream()— ends streaming earlyUses Flush (not Sync) to keep the portal alive between batches. Sync is sent only on completion, error, or early close. A
_completingflag guards againstfetch_more/close_streamsending messages afteron_command_completehas already sent Sync — the receiver may callfetch_more()in response to the finalpg_stream_batchbeforeReadyForQueryarrives.Only
PreparedQueryandNamedPreparedQueryare supported — streaming requires the extended query protocol.Design: #72